How to control the starting fuel injection quantity of automobile ecu? 0? three

The fuel injection quantity is that the four output pins on the ECU are directly connected to one end of each injector coil, and the other end of the injector coil is the ignition wire (+12V). As long as the output pin of ECU is zero, the fuel injector will start fuel injection (not zero potential).

In addition, the ignition advance angle of the engine under various working conditions is also pre-compiled and stored in the source program. According to the real-time information of speed and load, plus the information of water temperature and intake temperature, the ignition advance angle can be corrected and the optimal ignition time of the engine can be obtained.

Extended data:

When the car starts, the engine is driven by the starter motor. Because the speed is very low and the speed fluctuates greatly, the intake signal measured by the air flow sensor has a great error. Therefore, when the engine is started, the ECU does not use the signal of the air flow sensor as the basis for calculating the fuel injection amount.

The ECU judges whether the engine is in the starting state through the signals of the start switch and the speed sensor, so as to decide whether to control the fuel injection according to the starting program. When the start switch is turned on and the engine speed is lower than 300 rpm, the ECU determines that the engine is in the start state, so as to control the fuel injection according to the start program.

In addition, in the process of starting the fuel injection control program, the ECU calculates the fixed fuel injection quantity according to the engine water temperature, intake air temperature and starting speed. This fuel injection quantity can make the engine get the rich mixture needed for a smooth start.